Configure Highly Available STorage (HAST) on FreeNAS

FreeNAS (+FreeNAS) is excellent but it lacks the HAST (Highly Available STorage) feature, However, TrueNAS has this feature integrated. FreeNAS is a FreeBSD-based (nanobsd) open source Network Attached Storage Platform developed by iXsystems, that supports file sharing across Windows, Apple, and UNIX-like systems.

Since FreeBSD has already integrated the HAST in base system, this feature can be added to FreeNAS manually.